<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
</head>

<body>
<div id="box">
</div>
</body>
<script type="text/javascript">
// let {toString: s} = 123;
//  // true
// alert(s === Number.prototype.toString); 
// console.log(s); 
// // let {toString:s} = true;
// // s === Boolean.prototype.toString // true

// let { prop: x } = { true }; // TypeError
// console.log({prop: x}); // undefined
</script>

</html>